Jack.



A. J. OLIVER.

JACK.

APPLICATION FILED SEU. 12. 19u.

1,281,818. Patented 001.15, 1918.

lll 1"" lwefam@ /y C# J lz ver 55 carried at the lower end of the lifting shoe yso ANDREW J'. OLIVER, 0F CHICAGO, ILLINOIS.

JACK.

Specification of Letters Patent.

Application filed September 12, 1917. Serial No. 190,887.

To @all 'whom' t may concern.'

Be it known that I, ANDREW J. OLIVER, a` citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Jacks, of which the following is a specification.

The invention relates to lifting jacks of the type comprisinga supporting standard, a lifting bar, and lever-actuated mechanism for raising and lowering said bar; and the general object of the inventionl is to provide a very practical'and eiiicient jack. y

A more specific object of the invention is to provide improved raising and lowering mechanism which is of very simple andyet durable construction and the operation of which isfeasy and positive.

' KThe objects of the invention thus generv'ally'sta'ted are attained by the construction and arrangement set Vforth in the accompanying drawings forming part hereof, in which Figure 1v is a side elevation of the improved jack.y Fig. 2 is a top plan view, with parts in section on line 2-2 of Fig. 1. Fig. 3 is a central sectional view on line 3 3 of Fig. 2. Fig, 4 is a fragmental side elevation lon an enlarged scale showing a portion of the operating mechanism. Figs. 5 and 6 are side elevations, showing the opposite sides, respectively, of the holding member for the rack bar.

The jack comprises a. standard 1, a rack bar 2 slidably mountedv therein, a pinion 3 meshing with the rack bar, a lever 4 having a spring-controlled actuating member 5 shiftable into and out of operative engagement with said pinion, and a holding member 6 for the rack bar having a pivoted controlling weight 7 said holding member being adapted to be engaged by the member 5 at the end of the upward movement'of the lever. v Y

The standard l, having a supportingbase 8, is made hollow to receive the rack bar 2 and at its forward edge is enlarged as at,9 to house the actuating mechanism for the rack bar. At its opposite or rearward edge the standard is provided with a vertical slot 10 in which a lifting shoe 11 on the rack bar is adapted to operate; and the upper end of the standard is fianged as at 12 to form a guide for the rack bar 2, which is in the form of an eye beam, and to form a stop against which the transverse pin 13 is adapted to engage to limit the upward movement of the rack bar. n i

The rack bar 2 is provided at its rear edge with rack teeth 14 and the pinion 3 meshing with said rack teeth is mounted onJ ratenteu oct. i5, 191s.

vided in the lever a short distance rearward of the pin 18 to receive a compression spring 20 which 1s connected to a rearwardly extending arm 21 carried by the actuating member 5. The member 5 has a lower for- Ywardly extending portion or dog 5a having a notched face 5 for engagement with the teeth of the pinion 3, and an upper forwardly extending portion orlug 5b having a pair of cam surfaces 5d. and 5e formed on its upper side which are adapted to engage with the holding member 6 for the rack bar. The rearwardly extending arm 21 is so positioned with reference to the dog 5a and lug 5b that it lies in a plane substantially midway therebetween so that the fcompression spring 20 holds the member at one side or the other of deadY center; and the parts are so proportioned and arranged .that when the arm is forced below center,

the dog 5a (whichis then held in engagement with the pinion) mayl escape past a tooth against the action ofthe spring in the'upward movement ofthe lever without throwing the member tothe upperside of dead center.A

The holding member 6 for the rack bar is pivoted in the standard 1 above the pinion 3 on a pin 22. Said member is provided with a projecting Iportion or detent 6a extending upwardly through an opening 23 in the upper end of the standard and a projecting portion or finger 6* extending rear wardly through the opening 17 in the rear edge of the standard. IThe upper end of said detent is provided with a-nose 6 having a rearwardly inclined 4under surface; and upon one side of said detent above the pin 22 upon lwhich the holding member is mounted, is pivoted the weighted arm 7 for controlling the position `of the member 1n the operation of the jack.v ySaid arm 7 is mounted on a pivot pinr7a on a projection 7b`formed at one side of the detent and a stop 24 is also providedon s aidyproJectlon slightly below the pivot" pin 7a, whichY stop is arranged to be engaged by the opposite edges of the arm as it is swung downwardV leither .forwardly or rearwardly of the pin "522 'upon' which the holding member is mounted. As the arm engages with said stop, the holding member is rocked thereby to .movezthe ldetent either in or out of engagement with the krack bar, according to whether the arm is swung forwardly or V.rearwardly of the pin'22. On thefside of saiddetent'opposite' the arm 7 is a stop 25 (Figs. 2 ande), preferably formedlintegral With'the detent and arranged to engage with v'the wallof the standard at the edge` of the opening 23 to limit the forward downward movement of the holding member when-the detent is engaged byftherack bar.

rEhe fingerb of said controllmgmember hasa cam face 6d formed on fits under surface :which is arranged to be engaged by the pcaml lsurfaces 5fandf5e onthe member 5 to actuate the-controlling member 6;'v and the .up-per surface of said .'ngervengag'es with the standard ofthe upper edge of the openving 17 thereinand thus also' servesto-limit the downward forward movement of the del tent.

v rIn'the operation of theack, when it is desired to raise the rack bar, ythe weighted arm 7` on the detent 6a is swung forwardly 1n which positionY kit serves to norma'llyhold ,the detent in engagement with they teeth of 4the rack bar as vshown in Figs. 3 and 4, to

Ipermit an upward movement thereof, and to prevent .they rack bar .from being forced downwardly by a weight on itsv upper end `when the lever 4 is raised into position for a liftingstroke. -In this movement of the lever, the actuating `member having :been

shifted in the immediately preceding downagainst'the action of the spring 20-and intov engagement with said tooth, so that a downward movement ofthe lever rotates the pin'- ion and elevates-the rack'bar, the 'detent-6a being moved rearwardly by the immediately subjacent tooth of the rack bar engaging with the inclinedzunder surface of the vnose of the detent to-permit the upward movement ofthe-.rack bar'. VAt the end of the ldownward stroke, `the vdetent is Vcarried fortion yshown-in Fig. `3,'is9raised to lower the rack bar.V Near the end ofV its lupward movement, the forward cam "surfacefdon on the upper'side'of the'lug" engageswi-th the cam-faced ingertol'actuatethe holding lmember 16 to move'th"e .dvetentv forwardly with its'nose into engagement'with the `rack bar and in theffurther upward movementof lthe lever 'the rearward cam Asurface 5er of the lug l5"', engaging with the camV surface 6dv on the finger, shifts vv the actuating' member 5 against" the action of the spring 205 to move,

thedog 5a outfof engagementwith theapin` ionB. The lever then .lowered V,and .in the downward movement thereof the .forward end of the lug 5"' 'engageswith :one ofithe "teeth of the pinion 3 to againshift the ractuating member 5 so that Vthe "dogfarengages `with-the neXt'lower-tooth ofthegpinion, and in the further downward 'movement of the lever 1the pinion is Vactuated' to? raise, the" rack vbar a short distance, whereupon the Ydetent is released 'from engagement withtherack vbar and is carried Vinto 4inoperative position byv the weightedarm 7.' 'The next upward 4movement of y"the lever' thus-"lowers the rack ybar Yuntil `the detent` is again ,moved linto jeni gagem'ent therewithv by the y'lug 5b lengaging with the finger 6b, whereupon the actuating member 5 is shifted as 4before to clearith'e pinion vduring a'portionof the downward movement of thelever.

I claimfas Vmy invention: v p

1. 'A -ja'ck including -a i'standard, a vrack bar slidably `mounted in said standard', Va pinion-mounted in the standard and mesh'jing withthe rackbar, a holdingilmember for said rack bar with meansy for'limiting Aits forward movement and means for holding it in or out of engagement'withthe rackbar, and a lever pivoted in the standard and having an actuating ,memberv wi'thflmeans ,for holdingv itin or out of operative engagement withthe pinion, said actuating member jbeing adapted to engage withthe holding member in the upward movement of' the lever to 'move it fromI inoperative position into-engagement with the rack'bar and to be moved thereby `out of` engagement with the pinion. f

2. A ljack includinga standard, a rack bar slidably mounted'in said standard, a pinion mounted yinfthe standard andmesh ingewiththe rack bar,l a holding member for said rack fbar' having means forA limiting its Y forward movement,means for holding it in or outj offengagem'ent therewith and a camating member carried by said lever and-having a dog adapted to positively engage with said pinion to rotate it in a directionto raise the rack bar and to yieldingly engage with said' pinionto' rotate'it in a direction to lower the rack bar, and a cam-faced lug adapted toengage Awithf'the vram-faced actu'- ating finger of the holding member to move said holding member from inoperative position into engagement with the rack bar and to be moved thereby out of engagement with the pinion against the action of its controlling spring.

3. A jack including a standard, a rack bar slidably mounted in said standard, a pinion mounted in the standard and meshing with the rack bar, aholding member for said rack bar with a limited pivotal movement in the standard and having a weighted arm pivoted thereto and adapted to hold it either in or out of operative engagement with said bar, a lever pivoted in the standard, and an actuating member carried by said lever with means for holding it in or out of operative engagement with the pinion, said actuating member' being adapted to engage with the holding member in the upward movement of the lever to move it from inoperative position against the action of the weighted arm into engagement with the rack bar and be moved thereby out of engagement with the pinion against the action ot its controlling means.

t. A jack including a standard, a rack bar slidably mounted in said standard, a pinion mounted in the standard in mesh with the rack bar, means for actuating the pinion to raise and lower the rack bar, a holding member for the rack bar having a limited pivotal movement, and means for yieldingly holding said holding member in engagement with the rack bar to permit an upward movement thereof and to hold it against downward movement, or for yieldingly holding said member out oi' engagement with the rack bar to permit a downward movement thereof, the holding member being adapted to be engaged by the pinion-actuating means to be moved thereby into engagement with the rack bar and to move the actuating means out of engagement with the pinion.

A jack including a standard, a rack-bar slidably mounted in said standard, a pinion mounted in the standard in mesh with the rack-bar, means for rotating the pinion to raise and lower the rack-bar including a lever, an actuating member movable into and out of engagement with said pinion, and a holding member pivoted in the standard and having controlling means for holding it in or out of engagement with the rack-bar, said pinion-actuating member and said holding member being each adapted to be actuated j by engagement with the other when the lever reaches the'end of its upward movement in `the' operation of lowering the rack-bar.

46. 'A jack including a standard, a rack-bar slidably-mounted in said standard, a pinion mounted in the standard in mesh with the Vrack-bar, means for rotating the pinion to raise and lower the rack-bar including an actuating member movable into and out of engagement with said pinion, and a holding member for the rack-bar having a detent, means for holding the detent in or out of engagement with said rack-bar, and an actuating iinger adapted to be engaged by the pinion-actuating member to move the detent from inoperative to operative position and to shift the actuating member out of operative engagement with the pinion in the operation of lowering the rack-bar.

7. A jack including a standard, a rack-bar slidably mounted in said standard, a pinion meshing with the rack-bar, means for actuating the pinion to raise or lower the rackbar, and a holding member having a pivoted arm adapted to hold said member either in or out of engagement with said rack-bar, said member being adapted in one position of said arm to permit an upward movement of the rack-bar and to hold it against downward movement, and in another position of said arm to permit a downward movement of the rack-bar.

8. In combination with a jack having a standard, a rack bar slidably mounted in said standard, a lever mounted on a fixed pivot in said standard, a pinion, an actuating member yieldingly held either in or out of engagement with said pinion, and a holding member yieldingly held either in or out of engagement with said rack bar, said actuating member and said holding member being adapted to coperatively engage with the pinion and rack bar respectively in the operation of said lever to effect a raising of the rack bar and with the pinion and rack bar respectively and each other in the operation of said lever to automatically effect a lowering of said rack bar.

9. In combination with a jack, including a standard, a rack-bar slidably mounted in said standard, and a pinion, means for rotating said pinion to raise and lower the rackbar, including a lever, and a member movably mounted in said lever and adapted to be automatically moved into engagement with the pinion at the beginning of the downward movement of the lever, and to be automatically moved relative to the lever out of engagement with the pinion when the lever is operated to the extreme end of its upward movement, and a holding member standard, a pinion, 'an actuating member K t0 ccperatively v engagewthfthexpinion and rackvbar respectively inv the operation of seid. lever to e'e'ct Va raising' of thezrack bar-and With-the pinion andrackber respectively 15 and each other in the operation lof said'flever to` automatically .effect a lowering of said rack bar.

In testimony whereof, I have hereunto. set my hand.

movable `into end Y out .of .I enagementA with the rack-berend coperating with said actuatinglmemberto effect-a raising and lowering of therack-bztr.

l0. In combination With va jack including L standard, a rack bar slideble in said standard, a lever mounted von a fixed pivot in the mounted insaid lever for movement relative thereto, anda liold-lng member mounted 1n e v,

ysaid standard, said kmembers .being adapted ANDREW J. OLIVER.

Copies of this'patentmey be obtained forve cents each,` byeddressiingtvhe vtl'olnmiesioner4 if-:Patente Washington, D. G. 

